Onsite sewage treatment system - Laserfiche WebLink

Home Browse Search

OSTP Pump Selection Design UNIVERSITY Mirnesota Pollution Worksheet OF MINNESOTA ' Control Agency 10. Equivalent length of pipe fittings. Equivalent Length Factors (ft.)for PVC Pipe Fittings Section 10 is for Collection Systems ONLY and does NOT need to be completed for individual subsurface sewage treatment systems. Fitting Type Pipe Diameter(in.) 1 Y 2 3 Quantity X Equivalent Length Factor=Equivalent Length Gate Valve 1.07 1.38 2.04 90 Deg Elbow 4.03 5.17 7.67 Fitting Type Quantity Equivalent Equivalent 45 Deg Elbow 2.15 2.76 4.09 Length Factor Length (ft) Tee-Flow Thru 2.68 3.45 5.11 Tee-Branch Flow 8.05 10.30 15.30 Gate Valve X = Swing Check Valve 13.40 17.20 25.50 ,90 Deg Elbow X = Angle Valve 20.10 25.80 38.40 Globe Valve 45.60 58.60 86.90 45 Deg Elbow X = Butterfly Valve - 7.75 11.50 Tee-Flow Thru X = Tee-Branch Flow X = NOTE: Equivalent length values for PVC pipe fittings are based on calculations using the Hazen- Swing Check Valve X = Williams Equation. See Advanced Designs for SSTS Angle Valve X = for equation. Other pipe material may require Globe Valve X = different equivalent length factors. Verify other equivalent length factors with pipe material Butterfly Valve X = manufacturer. Valve 10 X = NOTE: System installer should contact system designer if the number of fittings varies from the Valve 11 X = design to the actual installation. A. ium of Equivalent Length due to pipe fittings: ft Hazen-Williams Equation for h B. notal Pipe Length =Supply Pipe Length (5.8)+Equivalent Pipe Length (9.A.) 1 0.5 ( [ ft + ft = ft h f D4.87 * '- . �I1.85 ,k L C. Hazen-Williams friction toss due to pipe fittings and supply pipe(hf): Qin gpm L in feet Din inches C= 130 (10.5 ÷ Pipe Diameter487) X ( Flow Rate : Constant)185 X Total Pipe Length (10.B) (10.54.8i in ) X ( gpm=130)1-65 X ft = ft 11. -otal Head requirement is the sum of the Elevation Difference (Line 3),the Distribution Head Loss(Line 4),Additional Head Loss(Line 5), and either Supply Friction Loss (Line 9),or Friction Loss from the Supply Pipe and Pipe Fittings for collection systems(Line 10.C) 11OTE:Supply Friction Loss(Line 8)need ONLY be used if NOT a collection system. IIOTE:Friction Loss from the Supply Pipe and Pipe Fittings(Line 9.C)need ONLY be used if system is a collection system. [ 9.0 ft + 5.0 ft + ft + 7.1 ft = 21.1 ft 3. PUMP SELECTION A Sump must be selected to deliver at least 38 GPM(Line 1 or Line 2)with at least 22 feet of total head. Comments: Pump type I hereby certify that I have completed this work in accordance with all applicable ordinances,rules and laws. Joseph J Olson 810 07/08/10 (Designer) (Signature) (License#) (Date)